I have a Dynex brand (best buy in-house brand) 720p 26" HD TV
One good thing about cheaper HD TVs very little Post processing, meaning almost no lag. I am talking less than 1 frame to 1 frame lag total. And excellent picture Quality.
What gives the most lag is image post processing.
All LCD TVs have various type of lighting
Pictures are for examples, not how the actual lighting element looks like behind the LCD screen.
Plasma
Plasma isn’t very good any more, it was all the rage when it was new in the late 90s. Problem is plasma is an excited gas that gives off light, and that gas will leak after a while and the plasma needs to be recharged. Issue is no one offers plasma recharging.
http://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Plasma-lamp_2.jpg/200px-Plasma-lamp_2.jpg
Incandescent bulb
Uses up the most power and produces heat, isn’t used any more in Flat Screen Tvs
Burns out and must be replace often, only used now on older models LCD and projection TVs
http://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Gluehlampe_01_KMJ.png/200px-Gluehlampe_01_KMJ.png
Cold Cathode Ray Tube
(not to be confused with CRT screens which also stands for Cathode ray tube)
Were taking the same tubes used in PC case lighting. Requires a power inverter to step up the voltage
Not too energy effciant
http://chem.illinois.edu/clcwebsite/graphics/cathwlines2.gif
Fluorescent lamp
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapor. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light.
http://www.allproducts.com/manufacture98/lylight/product1.jpg
LED
Light Emitting Diodes. The New standard as of some time last year when the Federal Government mandate new LCD TV sets have to be LED lit (Apparently). Or so As I been told.
Produces almost no heat, can stay lit almost forever, almost never burns out (well it eventually will decades down the road were taking 20 or more years).
uses the least amount of energy
http://www.ecotechninja.com/wp-content/uploads/2009/01/led-lights.jpg